Filing Details

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. ________)* Tsakos Energy Navigation Ltd (Name of Issuer) Common Stock, $1.00 Par Value (Title of Class of Securities) G9108L108 (CUSIP Number) JAVIER CASAMAYOR, PASEO DE LA CASTELLANA 110.28046 MADRID, SPAIN. 0034917378038 (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) December 04, 2017 (Date of Event which Requires Filing of this Statement) Appropriate box to designate the rule pursuant to which this Schedule is filed: Rule 13d-1(b) Rule 13d-1(c) Rule 13d-1(d)CUSIP No. G9108L108 Page 2 of 5 Pages 1. NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION AZVALOR ASSET MANAGEMENT, SGIIC, SA 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) (b) 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION SPAIN NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH 5. SOLE VOTING POWER 4,353,311. SHARED VOTING POWER 4,353,311. SOLE DISPOSITIVE POWER 0,00. SHARED DISPOSITIVE POWER 00,000. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,353,311. CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (see instructions)? 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.1284% 12. TYPE OF REPORTING PERSON (see instructions)

. Item 5.Ownership of Five Percent or Less of a Class. Not applicable. Item 6.Ownership of More than Five Percent on Behalf of Another Person. Not applicable. Item 7.Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company. Not applicable. Item 8.Identification and Classification of Members of the Group. Not applicable. Item 9.Notice of Dissolution of Group. Not applicable. Item 10.Certification. By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect. CUSIP No.G9108L108 Page 5 of 5 Pages After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. 12/11/2017 Date /s/ SERGIO FERNANDEZ-PACHECO RUIZ-VILLAR Signature CHIEF FINANCIAL OFFICER AND CHIEF OPERATIONAL OFFICER Name/Title